AnsweredAssumed Answered

Spurious noise on ADF4159 PLL

Question asked by pichonro on Jul 23, 2014
Latest reply on Apr 10, 2018 by Brigid.Duggan

Hi,

 

I have two boards : an EV-ADF4159EB1Z eval board and a prototype with an ADF4159 + 5-10 GHz VCO.

 

The two boards work well but I have a lot of spurious noise. It is a sweep noise like frequency modulation and covers span band wtih "Max hold" function on spectrum analyser.

 

I have attached printed screen of spectrum analyser .

 

I don't understand why I have this spurious noise.

 

Thanks in advance for your answers.

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